[dnr.wa.gov] Identification Tips: Whipplea modesta is the only species of its genus. It can be distinguished from the other genus of the hydrangea
family in Washington, Philadelphus, by its trailing, woody stems, while
species of Philadelphus are erect shrubs up to 10 feet (3 m) tall. (link added by Mary Ann Machi)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 03/28/2025).
